Cell coverage makes absolutely no sense to me. Austria and Switzerland have amazing mobile coverage but at the same time few people living there yet there is 4

Cell coverage makes absolutely no sense to me. Austria and Switzerland have amazing mobile coverage but at the same time few people living there yet there is 4G everywhere. Might sound like those are small countries, but they are also really spread out and hard to provide service for (lots of mountains). Yet the UK for instance has abysmal mobile coverage even in the densest populated areas. I can only assume that the general environment is different (regulatory, government subsidies etc.).